Abstract
A new tetrameric copper species is formed from the reaction of 3-aminopyridine and [Cu(MeCN)4]BF4. Four molecules per unit cell crystallize in the monoclinic space group P21/c, having a = 13.2552(7) Å, b = 17.8202(9) Å, c = 28.527(2) Å, β = 91.105(1), and a volume of 6737.1 Å [3], giving a calculated density of 1.482 g/mol. 22315 reflections were observed and the structure was refined to a final R 1 = 0.063 [I > 2σ(I)]. The distorted cubic core is composed of four copper(II) cations and four μ3-OH− ions. Two pyridine nitrogen atoms from the 3-aminopyridine ligands complete the Jahn-Teller distorted square-pyramidal coordination sphere around each copper. Longer, sixth bonds on two of the copper centers are made to a bridging MeCN. Three of the BF− 4 anions participate in intramolecular O‒H … F hydrogen bonding with the bridging hydroxide ions and N‒H … F with the free amino groups, while the remaining (disordered) BF4 forms intermolecular hydrogen bonds between tetramers.
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